"We have known that swine viruses get into humans occasionally, transmit for a generation or two and then stop. The issue is whether there will be sustained transmission (from person to person) — and that nearly never happens," Monto added.

The CDC has counted a total of 18 cases of this new virus, an influenza A strain known as S-OtrH3N2, in two years, which suggests that it''s not spreading quickly or easily, the article noted.

The 10 cases of H3N2 in 2011 also have been spread throughout the U.S. — in Pennsylvania, Maine, Indiana and Iowa — which doesn''t indicate a disease "cluster" or outbreak, the article added.